Abstract: Taking the hybrid model as the basic principle, FEM combined with measured horizontal displacement of dam crest was used to calculate the stream-wise horizontal displacement of dam crest respectively caused by dam body and foundation. Then the hybrid model of stream-wise horizontal displacement of overflow dam crest was established on these grounds. Finally, the elastic modulus of dam body and foundation were obtained respectively by inversion through the hybrid model, and the monitoring index was determined preliminarily. The result showed that, the measured value and fitted value were very close, and the multiple correlation coefficient was 0.892, the residual variance was 0.921, which proved the hybrid model had high precision, worthy reference.

Key words: hybrid model, overflow dam, elastic modulus, inverse analysis, monitoring index

摘要： 以混合模型为基本原理，结合大坝坝顶水平位移实测值，运用有限元分别计算由坝体和坝基引起的坝顶顺河向水平向位移，以此建立溢流坝坝顶顺河向水平位移的混合模型，通过混合模型分别反演坝体和坝基的弹模，并初步拟定监控指标。从计算结果看，实测值和拟合值非常接近，且其复相关系数R 为0.892，剩余方差为0.921，说明该混合模型精度较高，在反演坝体坝基弹模和设置监控指标中具有一定的价值，为工程运行提供参考。

关键词: 混合模型, 溢流坝, 弹模, 反演, 监控指标